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<' .I . . . Staff findings: CWCB staff has determined that the subject 100-year detailed floodplain information for the studied stream reaches is conformance with the CWCB's rules and regulations for floodplain designation and approval. The CWCB staff has relied on the technical competence of Boyle Engineering Corporation to perform the study and the technical review by the UD&FCD and local sponsors, and therefore endorses this study as containing the most current floodplain mapping available and urges the affected communities to adopt said study for land use regulation purposes pursuant to statutory authority. Staff recommendation; Staff recommends that the Board: I) designate and approve the I OO-year detailed floodplain information contained in said report within Jefferson County and the Town of Arvada, and 2) authorize staff to prepare a floodplain resolution to be signed by the Director and transmitted to the UD&FCD, the affected communities, and to FEMA. This action is recommended in order to meet statutory requirements. 2) Consent Al!enda Item 2.b Floodplain resolution number: FPR 04-575 Affected communities: Douglas County, Town ofSedalia (Urban Drainage & Flood Control District) Name of study to be formally acted on: "Flood Hazard Area Delineation, Plum Creek and East Plum Creek" dated August 2004. Studied streams: Plum Creek and East Plum Creek Technical Issues: This was authorized by the Urban Drainage and Flood Control District (UD&FCD) in conjunction with local sponsoring agencies, and documents the flood hazards for Plum Creek and East Plum Creek. The Plum Creek study reach extends from approximately 4,000 feet upstream of Airport Road upstream to the confluence with East Plum Creek and West Plum Creek (near Highway 67 in Sedalia). The East Plum Creek study limits extend from the confluence with Plum Creek upstream to the limits of the UD&FCD boundary (approx. 1,000 feet upstream of the BN&SF Railroad). Hydrologic analyses for this study were conducted as part ofFEMA's Flood Insurance Study for Douglas County and was not restudied for the FHAD. Water surface profiles were computed for the 10-, and 100-year flood events with 0.5 foot and 1.0 foot floodways. The report was prepared by Icon Engineering under contract to the UD&FCD. Community response: The UD&FCD transmitted a letter to the CWCB dated August 25, 2004 requesting CWCB designation and approval of the subject report. The UD&FCD also sent follow-up emails to staff regarding the proposed designation action. The UD&FCD staff worked directly with all of the affected communities during the course of the study and received input and endorsement for the study methods and results. CWCB staff concurs with the UDFCD request for designation and approval of the study. Staff findings: CWCB staffhas determined that the subject lOO-year detailed floodplain information for the studied stream reaches is conformance with the CWCB's rules and regulations for floodplain designation and approval. The CWCB staffhas relied on the technical competence ofIcon Engineering Corporation to perform the study and the technical review by the UD&FCD, and therefore endorses this study as containing the most current floodplain mapping available and urges the affected communities to adopt said study for land use regulation purposes pursuant to statutory authority. Staff recommendation: Staff recommends that the Board; 1) designate and approve the 100-year detailed floodplain information contained in said report within Douglas County, and 2) authorize staff to prepare a floodplain resolution to be signed by the Director and transmitted to the UD&FCD, the affected communities, and to FEMA. This action is recommended in order to meet statutory requirements. 3) Consent Al!:enda Item 2.c Floodplain Resolution Number: FPR 04-576 Affected Community: City of Blackhawk (Gilpin County) Flood Protection. Water Project Planning and Financing. Stream and Lake Protection Water Supply Protection. Conservation Planning 3